铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究

中国腐蚀与防护学报

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铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究

张志英,汤迦南,余杰,王旭东,黄罗超,邹俊文,唐浩,张继康,陈亚涛,程东鹏

武汉理工大学

Corrosion behavior of Cu-based metallic glass composites in NaCl solution

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摘要: 块体非晶合金复合材料 (Bulk Metallic Glass Composites, BMGCs) 保持了块体非晶合金 (Bulk Metallic Glasses, BMGs)的优异性能，如高强度、高硬度、良好的耐磨性、高弹性极限等，同时可以改善室温塑性，具有优异的综合性能，引起国内外广泛关注。本文通过差示扫描量热法 (Differential Scanning Calorimetry, DSC) ，升温速率为10 K/min，确定了铜基块体非晶合金Cu47.5Zr47.5-xAl5Hfx (x=0, 9.5)的玻璃转变温度Tg为712-722 K，晶化温度Tx为747-766 K。 X射线衍射 (X-Ray Diffraction, XRD)分析表明通过退火处理可获得铜基非晶合金或非晶-纳米晶复合材料。退火温度和退火时间影响组织结构和显微硬度。当退火温度高于Tg时，随着退火温度的升高以及退火时间的延长，显微硬度和结晶度逐渐增加然后趋于平缓。通过浸泡法和动电位极化法研究了铸态试样以及不同条件下退火后试样在3.5 wt.% NaCl溶液中的腐蚀行为。Cu47.5Zr47.5-xAl5Hfx (x=0, 9.5)试样在3.5 wt.% NaCl溶液中发生点蚀。与铸态试样相比，在623 K（即低于Tg）或773 K（即略高于Tx）退火30 min的试样的自腐蚀电位升高，腐蚀电流密度略微增加，耐腐蚀性变化不大。在923 K （即远高于Tx）退火30 min 后试样的自腐蚀电位显著降低，腐蚀电流密度变化不大，耐腐蚀性变差。Hf含量对耐腐蚀性的影响较小。

关键词 ：非晶合金复合材料, 退火, 腐蚀, 动电位极化, X射线衍射, 显微硬度

Abstract：Bulk Metallic Glass Composites (BMGCs) have excellent properties similar to the Bulk Metallic Glasses (BMGs), such as high strength, high hardness, good wear resistance and high elastic limit, and they may also exhibit improved plasticity at ambient temperature. Due to their excellent overall properties, BMGCs have attracted worldwide attention. In this work, Differential Scanning Calorimetry (DSC) was used with heating rate of 10 K/min to determine the glass transition temperature Tg and the crystallization temperature Tx of the Cu-based BMGs Cu47.5Zr47.5-xAl5Hfx (x=0, 9.5) to be 712-722 K and 747-766 K, respectively. X-Ray Diffraction (XRD) analysis confirmed that Cu-based metallic glass or metallic glass - nanocrystalline composites could be obtained through annealing. The microstructure and microhardness were affected by the annealing temperature and time. When the annealing temperature was above Tg, with the increase of annealing temperature and time, the crystallinity and the microhardness gradually increased and then leveled off. Immersion tests and potentiodynamic polarization tests were carried out to investigate the corrosion behaviors of the as-cast and annealed samples in 3.5 wt% NaCl solution. Pitting was observed in the Cu47.5Zr47.5-xAl5Hfx (x=0, 9.5) samples after immersion in 3.5 wt% NaCl solution. Compared with the as-cast samples, the samples annealed at 623 K (i.e. below Tg) or at 773 K (i.e. slightly above Tx) exhibited higher corrosion potential and slightly larger corrosion current density, indicating similar corrosion resistance. The samples annealed at 923 K (i.e. much higher than Tx) for 30 min exhibited much lower corrosion potential and similar corrosion current density, indicating poorer corrosion resistance. Hf content showed minor effect on the corrosion resistance.

Key words： Bulk metallic glass composite (BMGC) anneal corrosion potentiodynamic polarization X-ray diffraction (XRD) microhardness

收稿日期: 2017-11-11

ZTFLH:

TG146.4

基金资助:国家自然科学基金;武汉理工大学博士科研启动基金

通讯作者: 张志英

Corresponding author: Zhi-Ying ZHANG

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引用本文:

张志英汤迦南余杰王旭东黄罗超邹俊文唐浩张继康陈亚涛程东鹏. 铜基非晶合金复合材料在NaCl溶液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, .

链接本文:

https://www.jcscp.org/CN/Y0/V/I/0

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